it's irrelevant who you blame because your argument is a strawman and tu quoque logical fallacy.

Russia, and Russia alone is to blame for the war in Ukraine, as they are the ones who invaded and refuse to leave. The war will end only when they leave, regardless of how much you try to deflect blame onto anyone else.

edit: and the fact that you call the US a "warmonger" simply for helping Ukraine defend itself reminds me of this:

“DARVO is an acronym used to describe a common strategy of abusers. The abuser will: Deny the abuse ever took place, then Attack the victim for attempting to hold the abuser accountable; then they will lie and claim that they, the abuser, are the real victim in the situation, thus Reversing the Victim and Offender.”

have a nice day.